About this product

CalMirror is a service that securely syncs multiple Google Calendars to prevent double-booking. Instead of exposing event details, it shares only your busy time slots with the other calendar. There is nothing special to configure: sign in with your Google account, pick the calendars to sync, and you're up and running. It also supports fine-grained customization — one-way or two-way sync, exclusion rules, buffer time before and after events, and field mapping — and can keep three or more calendars in sync at once. Event contents are never stored, so it's safe to use for both business and personal calendars.

Highlights

Shows only "Busy" and the time slot on the shared calendar — event details stay private
Reflects changes in real time, syncing smoothly across multiple accounts and three or more calendars
Flexible settings: one-way or two-way sync, exclusions, buffer time around events, and field mapping
Visualizes sync status and errors; privacy-first design that never stores event contents